innochecksum - Unix, Linux Command

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NAME

innochecksum - offline InnoDB file checksum utility

SYNOPSIS

Tag

Description

innochecksum [options] file_name

DESCRIPTION

innochecksum
prints checksums for
InnoDB
files. This tool reads an
InnoDB
tablespace file, calculates the checksum for each page, compares the calculated checksum to the stored checksum, and reports mismatches, which indicate damaged pages. It was originally developed to speed up verifying the integrity of tablespace files after power outages but can also be used after file copies. Because checksum mismatches will cause
InnoDB
to deliberately shut down a running server, it can be preferable to use this tool rather than waiting for a server in production usage to encounter the damaged pages.

innochecksum
cannot be used on tablespace files that the server already has open. For such files, you should use
CHECK TABLE
to check tables within the tablespace.

If checksum mismatches are found, you would normally restore the tablespace from backup or start the server and attempt to use
mysqldump
to make a backup of the tables within the tablespace.

Invoke
innochecksum
like this:

shell> innochecksum [options] file_name

innochecksum
supports the following options. For options that refer to page numbers, the numbers are zero-based.

o

Tag

Description

o

-c

Print a count of the number of pages in the file.

o

Tag

Description

o

-d

Debug mode; prints checksums for each page.

o

Tag

Description

o

-e num

End at this page number.

o

Tag

Description

o

-p num

Check only this page number.

o

Tag

Description

o

-s num

Start at this page number.

o

Tag

Description

o

-v

Verbose mode; print a progress indicator every five seconds.

COPYRIGHT

This documentation is free software; you can redistribute it and/or modify it only under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License.

This documentation is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with the program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or see http://www.gnu.org/licenses/.